Efficiency calculated by Swinburne’s test is _____________(a) Exactly equal(b) Over-estimated(c) Under-estimated(d) Depends on the manual errorsI had been asked this question in an online interview.This intriguing question originated from Swinburne’s Test topic in portion Efficiency and Testing of DC Machines

Efficiency calculated by Swinburne’s test is _____________(a) Exactl

1.	Efficiency calculated by Swinburne’s test is _____________(a) Exactly equal(b) Over-estimated(c) Under-estimated(d) Depends on the manual errorsI had been asked this question in an online interview.This intriguing question originated from Swinburne’s Test topic in portion Efficiency and Testing of DC Machines
Answer» Right option is (b) Over-estimated To elaborate: The stray-load loss cannot be determined by this test and hence EFFICIENCY is over-estimated. Correction can be applied after assuming the stray-load loss to be half the no-load loss, which is done generally. Also, TEMPERATURE MAY effect on RESISTANCE value which is not considered in this test.

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In field’s test generator field and motor field are connected in ______________(a) Series(b) Parallel(c) Alternatively, series and parallel(d) Not connectedI had been asked this question during a job interview.The doubt is from Hopkinson’s Test topic in section Efficiency and Testing of DC Machines
Why field test is conducted even if Hopkinson’s test is present?(a) Instability of an operation(b) Possibility of run-away speed(c) Both instability and possibility of run-away speed(d) Field test is not conductedI had been asked this question in examination.This intriguing question comes from Hopkinson’s Test in chapter Efficiency and Testing of DC Machines
Hopkinson’s test gives _______________(a) Combined iron losses of two machines which can be separated(b) Combined iron losses of two machines which can’t be separated(c) Doesn’t include iron losses(d) Depends on actual setupI got this question in semester exam.My question is based upon Hopkinson’s Test topic in division Efficiency and Testing of DC Machines
Hopkinson’s test is suitable for ______________(a) Small machines only(b) Small and medium machines(c) All machines(d) Only large machinesI got this question in my homework.I'd like to ask this question from Hopkinson’s Test in portion Efficiency and Testing of DC Machines
For carrying out load test on Hopkinson’s test setup _________________(a) Actual load is needed(b) By changing field currents in two machines load can be changed(c) Can’t carry out(d) By changing the armature current test is carried outI have been asked this question in quiz.The question is from Hopkinson’s Test topic in division Efficiency and Testing of DC Machines
Hopkinson’s test is a regenerative test.(a) True(b) FalseThe question was asked in final exam.I want to ask this question from Hopkinson’s Test topic in chapter Efficiency and Testing of DC Machines
What will happen if field current of motor in Hopkinson’s test is decreased?(a) Current through motor armature will increase(b) Current through motor armature will decrease(c) Current through motor armature will remain constant(d) Motor armature current can’t be determinedI got this question in an international level competition.This is a very interesting question from Hopkinson’s Test topic in portion Efficiency and Testing of DC Machines
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In Hopkinson’s test, two machines are connected in ______________(a) Series(b) Parallel(c) Can be connected in parallel or series(d) Two machines are not requiredThis question was addressed to me in a job interview.My query is from Hopkinson’s Test in chapter Efficiency and Testing of DC Machines
Hopkinson’s test requires ____________(a) One DC machine on which test is carried out(b) Two different DC machines(c) Two identical DC machines(d) Can be worked with one or two machinesI got this question during an internship interview.The origin of the question is Hopkinson’s Test topic in portion Efficiency and Testing of DC Machines

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